libressl: Update and fix build issue

disabled-packages/libressl/build.sh

@@ -1,11 +1,13 @@
 TERMUX_PKG_HOMEPAGE=http://www.libressl.org/
 TERMUX_PKG_DESCRIPTION="Library implementing the TLS protocol as well as general purpose cryptography functions"
 TERMUX_PKG_DEPENDS="ca-certificates"
-TERMUX_PKG_VERSION=2.4.0
+TERMUX_PKG_VERSION=2.5.0
 TERMUX_PKG_SRCURL=http://ftp.openbsd.org/pub/OpenBSD/LibreSSL/libressl-${TERMUX_PKG_VERSION}.tar.gz
 TERMUX_PKG_EXTRA_CONFIGURE_ARGS="--with-openssldir=$TERMUX_PREFIX/etc/tls"
 TERMUX_PKG_CONFLICTS="openssl"
 # etc/tls/cert.pem is provided by ca-certificates:
 TERMUX_PKG_RM_AFTER_INSTALL="etc/tls/cert.pem"
 
-CPPFLAGS+=" -DNO_SYSLOG"
+termux_step_pre_configure() {
+	CPPFLAGS+=" -DNO_SYSLOG"
+}